thats a off road truck basically used for hauling gravel or any material from one side to the other on a mine site in that picture you see the truck with rear end on stands wheels and final drives removed from both sides final drives contain the planetaries for the powertrain this is where one of the reductions take place for torque increase along with the planetaries the hub also contain the brake group still works like any other mechanical truck it still has an engine torque tranny shaft diff hubs and two cylinders for the dump body that is the smallest truck that ive worked on normally i work on s what you see beside that is an engine that is a hp c engine for f trucks